The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 26, 2004
Filed:
Oct. 10, 2002
Anthony Scanlan, Limerick, IE;
John Patrick Purcell, Limerick, IE;
Analog Devices, Inc., Norwood, MA (US);
Abstract
A multi-channel circuit ( ) comprising three channels (CH to CH ), each of which is provided with a current steering DAC ( ) in which crosstalk between the respective DACs ( ) is minimized. Each DAC ( ) comprises binary scaled current source devices (Q to Q ) and current steering switches (Q and Q to Q to Q ) for steering currents from the current source devices (Q to Q ) to summing nodes ( ) across which an analogue signal is developed corresponding to a digital input word. Cascode devices (Q to Q ) are provided between the respective current source devices Q to Q and the corresponding current steering switches (Q and Q to Q and Q ) for preventing capacitive feedthrough of voltage swings on the current steering switches (Q and Q to Q and Q ) for minimizing crosstalk between the DACs ( ). Gates of the cascode devices (Q to Q ) of DACs ( ) are biased from corresponding cascode bias voltage circuits ( ), and the gates of the cascode devices (Q to Q ) of each DAC ( ) are isolated from the gates of the cascode devices (Q to Q ) of the other DACs ( ) also for minimizing crosstalk.